Congruences among modular forms on U(2,2) and the Bloch-Kato conjecture

Details Congruences among modular forms on U(2,2) and the Bloch-Kato conjecture Congruences among modular forms on U(2,2) and the Bloch-Kato conjecture

2007-10-12

arxiv.org/abs/0710.2549v1

Mathematics

Number Theory

57 pages

Scientific paper

Let k be a positive integer divisible by 4, l>k a prime, and f an elliptic cuspidal eigenform of weight k-1, level 4, and non-trivial character. Let \rho_f be the l-adic Galois representation attached to f. In this paper we provide evidence for the Bloch-Kato conjecture for a twist of the adjoint motif of \rho_f in the following way. Let L(f,s) denote the symmetric square L-function of f. We prove that (under certain conditions) the l-adic valuation of the algebraic part of L(f, k) is no greater than the l-adic valuation of the order of S, where S is (the Pontryagin dual of) the Selmer group attached to the Galois module \ad^0\rho_f|_{G_K} (-1), and K= Q(i). Our method uses an idea of Ribet in that we introduce an intermediate step and produce congruences between CAP and non-CAP modular forms on the unitary group U(2,2).

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